Release version 1.3.0 - License management and settings sub-tabs

Breaking Changes:
- PHP 8.3+ now required (previously 7.4+)

Added:
- License management integration using magdev/wc-licensed-product-client
- Settings page split into General and License sub-tabs
- License validation and activation via AJAX
- PHP version check with admin notice

Changed:
- Refactored settings class to use modern WooCommerce patterns
- Updated all translations with new license-related strings

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

wc-tier-and-package-prices.php

@@ -4,13 +4,13 @@
  * Plugin Name: WooCommerce Tier and Package Prices
  * Plugin URI: https://src.bundespruefstelle.ch/magdev/wc-tier-package-prices
  * Description: Add tier pricing and package prices to WooCommerce products with configurable quantities at fixed prices
- * Version: 1.2.9
+ * Version: 1.3.0
  * Author: Marco Graetsch
  * Author URI: https://src.bundespruefstelle.ch/magdev
  * Text Domain: wc-tier-package-prices
  * Domain Path: /languages
  * Requires at least: 6.0
- * Requires PHP: 7.4
+ * Requires PHP: 8.3
  * WC requires at least: 8.0
  * WC tested up to: 10.0
  * License: GPL v2 or later
@@ -21,9 +21,32 @@ if (!defined('ABSPATH')) {
     exit; // Exit if accessed directly
 }
 
+// Check PHP version requirement
+if (version_compare(PHP_VERSION, '8.3.0', '<')) {
+    add_action('admin_notices', 'wc_tpp_php_version_notice');
+    return;
+}
+
+/**
+ * Display PHP version notice
+ */
+if (!function_exists('wc_tpp_php_version_notice')) {
+    function wc_tpp_php_version_notice() {
+        ?>
+        <div class="notice notice-error">
+            <p><?php printf(
+                /* translators: %s: Current PHP version */
+                __('WooCommerce Tier and Package Prices requires PHP 8.3 or higher. Your server is running PHP %s.', 'wc-tier-package-prices'),
+                PHP_VERSION
+            ); ?></p>
+        </div>
+        <?php
+    }
+}
+
 // Define plugin constants
 if (!defined('WC_TPP_VERSION')) {
-    define('WC_TPP_VERSION', '1.2.9');
+    define('WC_TPP_VERSION', '1.3.0');
 }
 if (!defined('WC_TPP_PLUGIN_DIR')) {
     define('WC_TPP_PLUGIN_DIR', plugin_dir_path(__FILE__));